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FITTER - CITS

LESSON 17: Introduction Of Locking Device

Objectives

At the end of this lesson you shall be able to
• define a locking devices
• state the different types of locking devices
• state various uses of different types of locking devices.
Introduction Of Locking Device

• Introduction of Locking Device
A locking device is a mechanism designed to secure or restrict access to an object, space, or system. It
typically prevents unauthorized individuals from gaining entry, using, or tampering with the secured item.
Locking devices come in various forms, ranging from simple mechanical locks such as padlocks and deadbolts
to sophisticated electronic systems like keycard readers and biometric scanners.
The primary function of a locking device is to provide security and control over access. They are commonly
used in homes, businesses, vehicles, safes, cabinets, electronic devices, and many other applications where
safeguarding against unauthorized access or theft is necessary. Locking devices often require a specific key,
code, card, or biometric information to unlock them, ensuring that only authorized individuals can gain entry or
use the protected area or item.

• Types of Locking Device
1 Lock nut / chuck nut: A nut designed with a mechanism to prevent it from loosening unintentionally, commonly
used in machinery and automotive applications.

2 Pin nut: A nut with a hole drilled through it, allowing a pin to be inserted to prevent it from turning.
3 Split pin nut: Similar to a pin nut, but with a split pin (cotter pin) inserted through the nut and bolt to secure
them together.

4 Slotted nut: A nut with one or more slots or grooves on its face, allowing a locking mechanism such as a cotter
pin or a tab washer to be inserted to prevent loosening.
5 Castle nut: A nut with notches cut into the top, resembling the battlements of a castle, often used with a cotter
pin to secure bolts in place.
6 Whiz lock nut: A type of lock nut with a unique design that uses a series of wedges to create tension,
preventing the nut from loosening.
7 Simonds lock nut: A lock nut designed with multiple threads to provide a more secure locking mechanism.
8 Up spring washer locking: A locking mechanism that uses spring washers placed under the nut to create
tension and prevent loosening.

9 Lock plate nut / stop plate: A nut with a built-in plate or flange that acts as a stopper, preventing it from
loosening beyond a certain point.
10 Ring collar nut: A nut with a collar or flange attached, providing additional surface area for locking and
preventing rotation.
• Uses of locking devices
Locking devices serve a multitude of purposes across various industries and applications, primarily aimed at
enhancing security, safety, and control. Here are some common uses of locking devices:
1 Security: Locking devices are primarily used to secure doors, gates, cabinets, safes, and other enclosures to
prevent unauthorized access and theft.

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CITS : CG & M - Fitter - Lesson 16